1. University of Southampton, University Hospital Southampton National Health Service Trust, Southampton, United Kingdom
2. Department of Urology, National and Kapodistrian University of Athens and 2nd Department of Urology, Sismanoglio Hospital, Athens, Greece
3. Department of Urology, Patras University, Patra, Greece
4. Tenon Hospital, Pierre and Marie Curie University and Group Recherche Clinique Lithiase No. 20, Paris, France